§ 1521. County mosquito control commission; terms of office; oath. 1. The terms of office of all members of each county mosquito control commission, appointed after the expiration of the first appointment, shall be four years.

2. The members first appointed to the county mosquito control commission by the county board of supervisors in any district under the provisions of this article shall hold office respectively for the term of one, two, three and four years.

3. The term of the member appointed by the commissioner shall be four years.

4. Vacancies in such commission occurring by resignation or otherwise, shall be filled by the county board of supervisors in the manner provided in section one thousand five hundred twenty of this chapter, except any vacancy caused by resignation or otherwise of the member appointed by the commissioner shall be filled by the commissioner in the manner provided in section one thousand five hundred twenty of this chapter, and the persons so appointed to fill such vacancies shall be appointed for the unexpired term only.

5. Before entering upon the duties of his office each commission member shall take and subscribe an oath or affirmation before the clerk of the county in which is situated the district in and for which he is appointed to perform faithfully and impartially the duties of his office, which oath or affirmation shall be filed with such clerk.